\subsection{Space shuttle and Corvette}
The space shuttle accelerates from zero to 17{,}000 miles per hour
in 8 minutes.
A Corvette accelerates from zero to 60 miles per hour in 4.5 seconds.
The following script compares the two.

\medskip
\verb$vs=17000*"mile"/"hr"$

\verb$ts=8*"min"/(60*"min"/"hr")$

\verb$as=vs/ts$

\verb$as$

\verb$vc=60*"mile"/"hr"$

\verb$tc=4.5*"sec"/(3600*"sec"/"hr")$

\verb$ac=vc/tc$

\verb$ac$

\verb$"Time for Corvette to reach orbital velocity:"$

\verb$vs/ac$

\verb$vs/ac*60*"min"/"hr"$

\medskip
\noindent
Here is the result when the script runs.
It turns out that the space shuttle accelerates more than twice as fast as a
Corvette.

\medskip
$$a_s={\hbox{127500 mile}\over(\hbox{hr})^2}$$

$$a_c={\hbox{48000 mile}\over(\hbox{hr})^2}$$

\verb$Time for Corvette to reach orbital velocity:$

$$\hbox{0.354167 hr}$$

$$\hbox{21.25 min}$$

